Photomask blank



FIG. 1 is a front elevational view of a photomask blank showing my new design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a left side view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof;

FIG. 7 is an enlarged partial front view along line 7—7 in FIG. 1;

FIG. 8 is a reduced scale front, left side, top perspective view of the portion shown in FIG. 7; and,

FIG. 9 is a sectional view along line 9—9 in FIG. 7.

The broken line showing is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a photomask blank, as shown and described. 